Yellow-green triphenylmethane dye.



- 1,021,365. No Drawing.

UNITED STATES ATENT OFFICE.

ARTHUR HAUSDliRFER, OF ELBERFELD, AND CARL HEIDENREICH, 0F LEVERKUSEN, NEAR COLOGNE, GERMANY, ASSIGNORS TO FARBENFABRIKEN VORM. FRIEDR. BAYER & 00., 0F ELBERFELD, GERMANY, A CORPORATION OF GERMANY.

'able by reacting with the diazo compounds of the triphenylmethane leuco compounds derived from an aminobenzaldehydc and an aromatic oxycarboxylic acid upon an azo dyestufi' component and oxidizing the lcnco compounds. In thepresent application we wish to specifically describe and claim the product made from .Z-cliloro-i (i-dihrolno-5 aminobenzaldehyde, orthoeresotinic acid and 1-phenyl-3-methyl-5-py'azolone having most probably the formula:

CaH s N NH/ oo COOH oon on ctrn-e=enn .o CH3 1 (an In order to illustrate the new process more fully the following example is given. the parts being by weight. 80 parts of the leuco compound obtained from 1 molecule of 2 chloro-4.6-dihromo 5 anlinobenzaldo hyde and 2 molecules of ortlm-crcsotinic acid are dissolved in 300 parts of concentrated sulfuric acid and are then diazotizcd by means of a solution o'l. 9.2 parts of sodium nitrite in 180 parts of concentrated sulfuric'acid. To produce the coloring mat ter from thcleuco compound alter l-2 hours a solution of 9.2 parts of sodium nitrite in 180 parts oi. concentrated .sull'uric acid is added.' The mixture is then warmed to -60 C. during 1520 hours until the oxidation is complete. The red solution is poured on ice, the precipitate is filtered off,

Specification of Letters Patent.

Application filed August 22, 1911. Serial No. 645,433.

YELLOW-GREEN TRIPHENYLMETHANE DYE.

Patented Mar. 26, 1912.

I washed with wat and then with a 1 per cent. sulfurlc acid. The diazo compound 1s stirred up with (500 parts of ice vater and .l-nwthyl-Spyraxolone in, 30 parts of hydrochloric acid of19 B6. and 100 pnrts'ot' water. 80 parts of a 33 per cent. caustic soda lye is added. 'hen the copulation is complete the mixture is heated to (50 C., the dye is precipitated with sulfuri: acid, filtered ol'l', washed and dried.

The new dye is a red powder scarcely soluble in water and soluble in dilute alkalis with a-ycllowish coloration. It dyes wool from acid haths brown shades which on being treated with hichroinate change into a. full yellowislrgreen fast to i'ulling, potting and light.

The herein dcscrihed new dyestull having most probably the :l'orinula:

4:500 H Cl-la coon on cnn-( on to ga s N Cant Br I-Cl Altlllllllt llAfllSlX lll FER.

CARL ll El [)ljlNlt lGlCl l.

| L. s. l 11.. s.|

\Vit ncsscs:

L. Uni-inc. Aminn'r FR. N urea.

added to a solution ol 26 parts of. l-phcnyh 

